JPH0615146B2 - Method and apparatus for making a ruled surface of a cam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is a ruled surfa surface that serves as the working surface of a cam.
ce: relates to a method and apparatus for producing a curved surface formed by the movement of one straight line by grinding.

PRIOR ART British Patent No. 2116463A discloses a method and apparatus for making a ruled surface of a cam.

The method disclosed in this British specification for making a textured surface extending around a straight longitudinal axis and serving as the working surface of a cam is by rotating about one axis and machining. Prepare a grindstone having a surface, place this working surface in contact with the cam surface of the cam, rotate the cam about its axis, and about a fixed vertical axis that intersects the axis of the cam. A first reciprocating swivel motion is applied to the axis of the cam, a first displacement is applied to the grindstone to move the working surface of the grindstone in a predetermined linear direction, rotation of the cam about its axis, To provide control means such that the first reciprocating pivoting movement of the axis of the wheel and the first displacement of the grindstone cooperate to constantly maintain contact between the working surface of the grindstone and the fiber surface of the cam. Includes stages.

Further, the device disclosed in the above-mentioned British patent specification for making the ruled surface, which is the working surface of the cam, by grinding enables the first swiveling motion about the fixed vertical axis supported by the fixed structure. And a workpiece slide disposed on the workpiece head, the cam blank being disposed on the workpiece slide and rotated about its longitudinal axis. And includes a wheelhead arranged to rotate about its axis, with a tool spindle carrying the wheel coaxially with its axis, the wheelhead being moveable to said fixed structure Mounted on a shaft to permit a first displacement of the axis of rotation of the grindstone along a predetermined straight path, and further rotation of the cam about its longitudinal axis. , A control means for providing a predetermined relationship between a first pivoting movement of the workpiece head about the vertical axis and a first displacement of a wheel head having the tool spindle, the predetermined relationship Includes a device in which the working surface of the grindstone is always in contact with the ruled surface of the cam.

In such prior art methods and apparatus, a grindstone having an annular flat working surface was used.

(Problems to be Solved by the Invention) In the above-mentioned conventional technique, since the grindstone used has an annular flat working surface, there is a problem that the grindstone cannot be made to have a sturdy structure. Further, there is a problem that the diameter of the annular flat work surface becomes large and the stress due to the centrifugal force acting on the work surface of the grindstone becomes large. Furthermore, the grinding speed of the work surface is different at each radial position of the annular flat work surface, and the grinding speed is high near the outer circumference and small near the center. Therefore, there is a problem that the grinding speed is not uniform at each point on the line segment of the ruled surface which is the operating surface of the cam, and therefore uniform grinding work cannot be performed along the line segment.

(Means for Solving the Problems) When the reference numerals used in the embodiments of the present invention described later are additionally shown for reference, the method of the present invention is performed around a straight longitudinal axis Y. A method of grinding a ruled surface which extends and serves as an actuating surface 4 of a cam 3, said grinding wheel 1 being adapted to rotate about a horizontal axis of rotation X and whose working surface 2 is a cylinder. , The cylinder has a constant circular cross section and the axis of the cylinder coincides with the horizontal axis of rotation X of the grindstone, the horizontal axis of rotation X being a horizontal translation F and a vertical translation. A step of providing said grindstone 1 adapted to G and a bearing plate 13 for mounting a blank of the cam 3 to be ground to rotate about its axis Y,
A first reciprocating swivel motion L1 is imparted to the blank axis Y of the cam 3 about a vertical axis V intersecting the blank axis Y of the cam 3 and is orthogonal to the vertical axis V and Providing the bearing plate 13 adapted to impart a second reciprocating pivoting movement K1 to the axis Y of the blank of the cam 3 about a horizontal axis Z intersecting the axis Y of the blank of the cam 3. Rotatably mounting the cam 3 blank to the support plate 13, rotating the grindstone 1 about the horizontal rotation axis X in contact with the cam 3 blank and rotating the cam 3 blank. Rotating about its axis Y and imparting said first reciprocating swivel motion L1 to the axis Y of the blank of the cam 3 about the vertical axis V intersecting the axis Y of the blank of the cam 3. It In addition, the support plate 13 is moved so that the second reciprocating pivoting motion K1 is imparted to the blank axis Y of the cam 3 about the horizontal axis Z that intersects the blank axis Y of the cam 3. At the same time, the horizontal translational movement F and the vertical translational movement G are applied to the horizontal rotation axis X of the grindstone 1, so that the movements L1, K1, F, G cause At all rotational positions of the blank of the cam 3, the line segments 5 and 6 of the ruled surface are the horizontal rotational axis X of the grindstone 1.
Parallel to the work surface 2 so that the contact between the working surface 2 and the ruled surface of the cam 3 extends over the entire line segments 5, 6. .

The device of the present invention is a device for making a ruled surface, which is an operating surface 4 of a cam 3, by grinding, and includes a fixed structure 11 and a grindstone mounted on the fixed structure 11 so as to be horizontally movable. A base 17 and a tool slide 19 mounted on the grindstone base 17 so as to be vertically movable and having a tool spindle.
And a grindstone 1 having a horizontal rotation axis X coaxial with the tool spindle and a cylindrical work surface 2 and mounted on the tool slide 19, and the grindstone base is mounted on the horizontal rotation axis X. A horizontal translational motion F is imparted by the movement of 17 and a vertical translational motion G is imparted by the movement of the tool slide 19, and the blank of the grindstone 1 and the cam 3 has its axis line. A support plate 13 attached so as to rotate around Y, and an electric support plate 1
And a work piece head 12 rotatably mounted on the fixed structure 11.
And a first axis Y of the blank of the cam 3 about a vertical axis V intersecting the axis Y of the blank of the cam 3.
Reciprocating turning motion L1 of the vertical axis V
The bearing plate 1 such that a second reciprocating swivel motion K1 is imparted to the axis Y of the blank of the cam 3 about a horizontal axis Z orthogonal to the axis Y of the blank of the cam 3 and intersecting the axis Y of the blank of the cam 3.
3 is adapted to be rotated, said workpiece
A head 12, means for rotationally driving the tool spindle to rotate the grindstone 1 in contact with the blank of the cam 3 for rotation; means for rotating the blank of the cam 3 about its axis Y; 17, said tool slide 19, said support plate 13 and control means for controlling the movement of said workpiece head 12, said control means comprising said vertical axis intersecting the axis Y of the blank of said cam 3. The movement of the workpiece head 12 is controlled so that the first reciprocating pivoting movement L1 is imparted to the axis Y of the blank of the cam 3 about the axis V, and the axis Y of the blank of the cam 3 is controlled. The movement of the support plate 13 is controlled so that the second reciprocating turning movement K1 is applied to the axis Y of the blank of the cam 3 about the horizontal axis Z intersecting with each other, and at the same time. The movement of the grindstone base 17 is controlled so that the horizontal translational movement F is imparted to the horizontal rotation axis X of the grindstone 1, and the perpendicular to the horizontal rotation axis X of the grindstone 1. The movement of the tool slide 19 is controlled so as to impart a translational movement G in the direction, so that in all rotational positions of the blank of the cam 3, the line segments 5 and 6 of the ruled surface cause the grindstone 1 to move. Device located parallel to said horizontal axis of rotation X, such that the contact between said working surface 2 and said ruled surface of said cam 3 extends over said line segments 5,6. Is.

(Operation and Effect of the Invention) In the method and apparatus of the present invention, a grindstone having a cylindrical work surface is used. The cylinder has a constant circular cross section and the axis of the cylinder coincides with the axis of rotation of the grindstone. Such wheels are much more robust and less susceptible to damage than wheels having an annular, flat work surface. Further, the outer diameter of the grindstone having the cylindrical work surface can be made smaller than the outer diameter of the grindstone having the annular flat work surface. In the former, the working surface of the grindstone along the generatrix in the axial direction performs grinding work, whereas in the latter, the working surface of the grindstone along the radial line performs grinding work, so the outer diameter must be increased. Because there is no.
Therefore, when the grindstone having the cylindrical work surface and the grindstone having the annular flat work surface are driven at the same rotation speed, the stress due to the centrifugal force inevitably brought to the former work surface is more preferable. , The latter is less than the stress exerted on the work surface. Therefore, the risk of damaging the whetstone is less in the former. Further, in a grindstone having a work surface, the grinding speed of the work surface is the same at any point in the axial direction. Therefore, processing is performed at the same grinding speed at any point on the line segment of the ruled surface forming the operating surface of the cam, and uniform grinding work is performed along the line segment. However, with a grindstone having an annular flat work surface, it is not possible to perform uniform grinding work along the line segment as described above.

EXAMPLES The present invention will be described below with reference to the preferred embodiments illustrated in the accompanying drawings.

Reference numeral 1 is a cylindrical grindstone that rotates around the axis X.
The grindstone 1 has a constant circular cross section and a cylindrical working surface 2 coaxial with the axis X. The axis X can be displaced in the direction indicated by the arrow F. That is, translational movement in the horizontal direction is possible. Reference numeral 3 is a cam having a working surface 4, which is a ruled surface including a plurality of straight line segments. The cam 3 swivels around the axis Y,
Its working surface 4 has a variable shape without interruption along the axis Y. The cam 3 is perpendicular to the axis X of the grindstone 1 and the axis Y of the cam 3
It is possible to reciprocate around a fixed vertical axis V intersecting with. The cam 3 can reciprocate around a horizontal axis Z that is perpendicular to the axes Y and V. What is indicated by A is
It is a tangent surface to the operating surface 4 of the cam 3 along the line segment 5. Reference numeral 7 indicates a cylindrical work surface 2 arranged in a plane formed by moving the axis X of the grindstone 1 in the linear direction F.
Is the busbar of. The generatrix 7 in FIGS. 1, 5 and 6 is parallel to the line segment 5 and is aligned with it in the direction F. Therefore, when the grindstone 1 is moved in the direction F, the busbar 7 moves until it overlaps with the line segment 5. Shown at B is another tangent surface of the working surface 4 of the cam 3 along the line segment 6. The tangent surface B is an angle H about the tangent surface A about the axis Y.
It was just rotated. 2, 7 and 8
In the figure, the cam 3 is pivoted around the axis Y by an angle H in the direction of the arrow H1 as compared with the situation of FIG. In this state, the tangent surface B is perpendicular to the plane formed by the movement of the grindstone 1 in the direction F of the axis X. Figure 3,
In FIGS. 9 and 10, the axis Y of the cam 3 is the second
Compared to FIGS. 7, 7 and 8, it is turning around the axis Z by the angle K in the direction indicated by the arrow K1. With this turning, the line segment 6 is positioned such that the axis X of the grindstone 1 becomes parallel to the plane formed by moving in the direction F. Fourth
In FIGS. 11, 11 and 12, the axis Y of the cam 3 pivots around the axis V by an angle L in the direction indicated by the arrow L1 as compared with FIGS. 3, 9, and 10. . With this turning, the line segment 6 becomes a position parallel to the axis X of the grindstone 1. In this state, the line segment 6 is displaced by the amount indicated by E from the plane formed by moving the axis X of the grindstone 1 in the direction F. In FIG. 13, the grindstone 1 is the 4th
Compared to its position in FIGS. 11, 11 and 12, it is displaced by an amount E in the linear direction indicated by arrow G perpendicular to direction F. That is, the translational motion in the vertical direction is performed. With this displacement, the generatrix 7 of the grindstone 1 is aligned with the line segment 6 in the direction F. Therefore, the grindstone 1 is directed in the direction F.
The bus 7 is overlapped with the line segment 6 when it is translated. The details of the method of the present invention are as follows with reference to FIGS. 1 to 13. In FIGS. 1, 5, and 6, the grindstone 1 is displaced along the direction F, and the line segment 5
Come into contact with. Subsequently, the cam 3 is rotated around its axis Y, and at the same time, the position of the cam 3 is changed to the axis Z.
Is corrected by the pivoting movement of the cam 3 about the axis V and the axis V while the grindstone 1 is displaced in either direction F and G. The cam 3 and the grindstone 1 and such movements are conventionally known control means so that the generatrix 7 of the grindstone 1 contacts with a specific line segment of the ruled surface of the cam 3, regardless of the relative position of the cam 3 with respect to the grindstone 1. Numerically controlled by (not shown). Such operation is illustrated in FIGS. 2 and 13. Referring to the tangent surface B in contact with the operating surface 4 in both the above drawings, the correct positions of the grindstone 1 and the cam 3 are the turning of the cams 3 at the angles H, K and L and the displacement of the grindstone 1 in the directions F and G. Obtained by. If the shape to be obtained for the ruled surface of the cam 3 is known, the value of the turning angle of the cam 3 and the amount of displacement of the grindstone 1 can be determined for each tangent surface B. In FIG. 14, an apparatus capable of realizing the above-described manufacturing method is shown by 10 in its entirety. The apparatus 10 comprises a base (i.e., a fixed structure) 11 having a workpiece head 12 mounted thereon for pivotal movement about a fixed vertical axis V. Workpiece head 1
2 supports a support plate 13 so as to be rotatable around a horizontal axis Z that is perpendicular to the axis V. A work piece slide 14 having a cam shaft 15 pivotably attached thereto is slidably mounted on the support plate 13. The cam shaft 15 is pivotable about an axis Y which is perpendicular to the axis Z and the axis V, and the cam shaft 15 can be rotated by the motor 1.
It is rotationally driven by 6. The base portion 11 has a linear direction F
The grindstone base 17 is attached so as to be displaceable along. The direction F is perpendicular to the axis V. The displacement of the wheel head 17 is performed along the dovetail guide member 18. Whetstone stand 17
A chuck receiving slide (that is, a tool slide) 19 is displaceably attached to the plate along the linear direction G. The direction G is perpendicular to the direction F. The chuck receiving slide 19 comprises a tool spindle, on which a grindstone 1 having a constant circular cross section and a cylindrical working surface 2 coaxial with the axis X is mounted. This axis X is perpendicular to the axis V and the directions F and G. A prime mover (not shown) gives the grindstone 1 a rotational movement. Device 10
The operation is as follows. The cam shaft 15 is rotated by the electric motor 16 in the direction indicated by the arrow H1.
At the same time, the numerical control means (not shown) causes the support plate 13 to move.
Is swiveled about axis Z in the direction indicated by arrow K1 and workpiece head 12 is swiveled about axis V in the direction indicated by arrow L1. At the same time, by the action of the numerical control means (not shown), the grindstone base 17 moves in the direction F and the chuck receiving slide 19 also moves in the direction G. With such movement, the grindstone 1 is always in contact with an adjacent cam (indicated by 3) on the cam shaft 15 along one of the line segments forming the ruled surface of the cam 3 at any time. become.

Retaining the solution principle of the invention as it is, the actual implementation can be greatly modified compared to what has been described and illustrated above without departing from the scope of the invention. For example, in order to achieve correct contact between the grindstone 1 and the cam 3,
Since the above-mentioned movement has a meaning as a relative movement rather than an absolute movement, it is possible to give a part of the movement given to the cam to the grindstone instead, or conversely to give the movement of the grindstone to the cam instead. it can.

[Brief description of drawings]

1, 2, 3, and 4 are schematic perspective views for explaining each successive step of the method according to the invention, FIG. 5 is a plan view of FIG. 1, and FIG. FIG. 5 is a side view taken along arrow VI in FIG. 5, FIG. 7 and FIG. 8, FIG. 9 and FIG. 10, FIG. 11 and FIG.
The figures are respectively the plan view and side view of FIGS. 2, 3, and 4, and FIG. 13 is the side view showing the positional relationship between the grindstone and the cam at the further stage of the method according to the present invention, and FIG. FIG. 1 is a perspective view of an apparatus suitable for carrying out the method of the present invention. 1 ... Whetstone, 2 ... Working surface, 3 ... Cam, 4 ... Operating surface, 5 ... Line segment, 6 ... Line segment, 7 ... Bus line, 10 ... Device (whole), 11 ... Base, 12 ... Workpiece head, 13 ... Bearing plate, 14 ... Workpiece slide, 15 ... Cam shaft, 16 ... Electric motor, 17 ...
… Grindstone stand, 18 …… Dovetail guide member, 19 …… Chuck receiving slide.

Claims (2)

[Claims] 1. A method of grinding a ruled surface which extends around a straight longitudinal axis (Y) and which serves as an actuating surface (4) of a cam (3), comprising a horizontal axis of rotation ( X) and a grinding wheel (1), the working surface (2) of which is a cylinder, the cylinder having a constant circular cross section and the axis of the cylinder being the horizontal axis of rotation of the grinding wheel. (X), and this horizontal rotation axis (X) has a horizontal translational motion (F) and a vertical translational motion (G).
Providing the grinding wheel (1) and the blank of the cam (3) to be ground with its axis (Y)
A bearing plate (13) mounted for rotation around a blank axis (V) of the cam (3) about a vertical axis (V) which intersects the blank axis (Y) of the cam (3). A horizontal axis (Z) which is adapted to impart a first reciprocating swivel motion (L1) to Y) and which is orthogonal to said vertical axis (V) and intersects the blank axis (Y) of said cam (3). Around the blank axis (Y) of the cam (3)
With a bearing plate (13) adapted to impart a second reciprocating swivel motion (K1) to the bearing plate, and a blank of the cam (3) is rotatably attached to the bearing plate (13). Rotating the grindstone (1) about the horizontal axis of rotation (X) in contact with the blank of the cam (3) and turning the blank of the cam (3) about its axis (Y). Rotating, and the first reciprocating swivel to the blank axis (Y) of the cam (3) about the vertical axis (V) intersecting the blank axis (Y) of the cam (3). Motion (L1) is applied and the blank axis (Y) of the cam (3)
The cam (3) around the horizontal axis (Z) intersecting with
The second reciprocating swivel motion (K
1) is moved so that the support plate (13) is applied, and at the same time, the horizontal translational motion (F) and the vertical translational motion of the grindstone (1) on the horizontal rotation axis (X). A motion (G) is applied so that such motions (L1, K1, F, G) cause line segments (5, 6) of the ruled surface at all rotational positions of the blank of the cam (3). ) Is positioned parallel to the horizontal rotation axis (X) of the grindstone (1), and the working surface (2)
A contact between the cam and the ruled surface of the cam (3) over the line segments (5, 6). 2. An apparatus for producing a ruled surface, which is an operating surface (4) of a cam (3), by grinding, comprising a fixed structure (11) and a horizontal movement on the fixed structure (11). A grindstone mount (17) movably mounted, and a tool slide (19) mounted on the grindstone mount (17) so as to be vertically movable and having a tool spindle.
A horizontal axis of rotation (X) coaxial with the tool spindle and a cylindrical working surface (2), and the tool slide (1)
A grindstone (1) mounted on 9), wherein a horizontal translational motion (F) is imparted to the horizontal rotation axis (X) by movement of the grindstone base (17), and the tool slide is A vertical translational motion (G) is imparted by the movement of (19), and the grindstone (1) and the blank of the cam (3) are attached so as to rotate about their axis (Y). A bearing plate (13) and a work piece head (12) rotatably supporting the bearing plate (13) and rotatably mounted on the fixed structure (11), A first reciprocating swivel motion (L1) is imparted to the blank axis (Y) of the cam (3) about a vertical axis (V) intersecting the blank axis (Y) of the cam (3), and , Orthogonal to the vertical axis (V) and to the cam (3) The bearing plate (13) such that a second reciprocating swivel motion (K1) is imparted to the blank axis (Y) of the cam (3) about a horizontal axis (Z) intersecting the blank axis (Y). A workpiece head (12) adapted to be rotated and means for rotationally driving the tool spindle to rotate the grindstone (1) in contact with the blank of the cam (3). Means for rotating the blank of the cam (3) about its axis (Y), the grindstone (17), the tool slide (19), the bearing plate (13) and the work piece head (12). )
Means for controlling the movement of said cam (3) blank about said vertical axis (V) intersecting the axis (Y) of the blank of said cam (3). Controlling the movement of the workpiece head (12) such that the first reciprocating pivoting movement L1 is imparted to the axis (Y) of the cam (3) and intersecting the blank axis (Y) of the cam (3). Around the horizontal axis Z, the second axis is aligned with the blank axis (Y) of the cam (3).
The movement of the support plate (13) is controlled so that the reciprocating turning movement (K1) of the grinding wheel (1) is applied, and at the same time, the horizontal translational movement (F) is applied to the horizontal rotation axis (X) of the grindstone (1). ) Is applied to control the movement of the grindstone base (17), and the vertical translational motion (G) is applied to the horizontal rotation axis (X) of the grindstone (1). The movement of the tool slide (19) is controlled so that the line segments (5, 6) of the ruled surface at the horizontal position of the grindstone (1) at all rotational positions of the blank of the cam (3). Located parallel to the direction axis of rotation (X), the contact between the working surface (2) and the ruled surface of the cam (3) over the entire line segment (5, 6) The device that makes you stay.